yuzu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2025-02-25 23:56:58 +00:00
Code Issues Packages Projects Releases Wiki Activity

arm/translate-a64: add FP16 FNEG/FABS to simd_two_reg_misc_fp16

Browse source 
Neither of these operations alter the floating point status registers
so we can do a pure bitwise operation, either squashing any sign
bit (ABS) or inverting it (NEG).

Backports commit 15f8a233c8c023dbc77b6fe6cd7c79eac9bee263 from qemu
This commit is contained in:
Alex Bennée 2018-03-08 18:51:27 -05:00 committed by Lioncash
parent 7161c1ed52
commit c590ff441c
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 15 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
qemu/target/arm/translate-a64.c
View file

@ -11418,6 +11418,7 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
TCGv_i32 tcg_rmode = NULL; TCGv_i32 tcg_rmode = NULL;
TCGv_ptr tcg_fpstatus = NULL; TCGv_ptr tcg_fpstatus = NULL;
bool need_rmode = false; bool need_rmode = false;
bool need_fpst = true;
int rmode; int rmode;
if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) { if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) {
@ -11536,6 +11537,10 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
need_rmode = true; need_rmode = true;
rmode = FPROUNDING_ZERO; rmode = FPROUNDING_ZERO;
break; break;
case 0x2f: /* FABS */
case 0x6f: /* FNEG */
need_fpst = false;
break;
default: default:
fprintf(stderr, "%s: insn %#04x fpop %#2x\n", __func__, insn, fpop); fprintf(stderr, "%s: insn %#04x fpop %#2x\n", __func__, insn, fpop);
g_assert_not_reached(); g_assert_not_reached();
@ -11558,7 +11563,7 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
return; return;
} }
if (need_rmode) { if (need_rmode || need_fpst) {
tcg_fpstatus = get_fpstatus_ptr(tcg_ctx, true); tcg_fpstatus = get_fpstatus_ptr(tcg_ctx, true);
} }
@ -11588,6 +11593,9 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
case 0x7b: /* FCVTZU */ case 0x7b: /* FCVTZU */
gen_helper_advsimd_f16touinth(tcg_ctx, tcg_res, tcg_op, tcg_fpstatus); gen_helper_advsimd_f16touinth(tcg_ctx, tcg_res, tcg_op, tcg_fpstatus);
break; break;
case 0x6f: /* FNEG */
tcg_gen_xori_i32(tcg_ctx, tcg_res, tcg_op, 0x8000);
break;
default: default:
g_assert_not_reached(); g_assert_not_reached();
} }
@ -11631,6 +11639,12 @@ static void disas_simd_two_reg_misc_fp16(DisasContext *s, uint32_t insn)
case 0x59: /* FRINTX */ case 0x59: /* FRINTX */
gen_helper_advsimd_rinth_exact(tcg_ctx, tcg_res, tcg_op, tcg_fpstatus); gen_helper_advsimd_rinth_exact(tcg_ctx, tcg_res, tcg_op, tcg_fpstatus);
break; break;
case 0x2f: /* FABS */
tcg_gen_andi_i32(tcg_ctx, tcg_res, tcg_op, 0x7fff);
break;
case 0x6f: /* FNEG */
tcg_gen_xori_i32(tcg_ctx, tcg_res, tcg_op, 0x8000);
break;
default: default:
g_assert_not_reached(); g_assert_not_reached();
} }